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Does pandas iterrows have performance issues?
...pply
a) reductions that can be performed in cython
b) iteration in python space
4) itertuples
5) iterrows
6) updating an empty frame (e.g. using loc one-row-at-a-time)
Using a custom Cython routine is usually too complicated, so let's skip that for now.
1) Vectorization is ALWAYS, ALWAYS ...
How can I quantify difference between two images?
...ot, you may need to resize or crop them. PIL library will help to do it in Python.
If they are taken with the same settings and the same device, they are probably the same.
Are images well-aligned?
If not, you may want to run cross-correlation first, to find the best alignment first. SciPy has fun...
How to handle exceptions in a list comprehensions?
I have some a list comprehension in Python in which each iteration can throw an exception.
6 Answers
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Change the name of a key in dictionary
I want to change the key of an entry in a Python dictionary.
15 Answers
15
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Faster s3 bucket duplication
... answered May 10 '14 at 5:55
python1981python1981
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What's a correct and good way to implement __hash__()?
...getting and combining hashes to C builtins, which is typically faster than Python level code.
– ShadowRanger
Nov 4 '19 at 23:18
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如果...
Creating Threads in python
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Python 3 has the facility of Launching parallel tasks. This makes our work easier.
It has for thread pooling and Process pooling.
The following gives an insight:
ThreadPoolExecutor Example
import concurrent.futures
impo...
Can a variable number of arguments be passed to a function?
...nyArgs(1, 2, 3)
I was called with 3 arguments: (1, 2, 3)
As you can see, Python will unpack the arguments as a single tuple with all the arguments.
For keyword arguments you need to accept those as a separate actual argument, as shown in Skurmedel's answer.
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Read password from stdin
Scenario: An interactive CLI Python program, that is in need for a password. That means also, there's no GUI solution possible.
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